After the Baden-Marathon Karlsruhe: Northern Black Forest
The Route: Karlsruhe Hauptbahnhof → Baden-Baden → Gernsbach / Forbach (Murg valley) → Frankfurt Airport Logistics: Regional rail to Baden-Baden as a base, then the Murgtalbahn line running directly along the Murg river into the forest. Marathon Month: September Duration: 2 nights
Karlsruhe Hbf ──(regional rail, ~20-25 min)──> Baden-Baden ──(Murgtalbahn, 20-40 min)──> Gernsbach / Forbach
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Frankfurt Airport (FRA) ◄──(rail via Baden-Baden, ~1hr 40)──┘
Baden-Marathon Karlsruhe finishes on the track inside Carl-Kaufmann-Stadion, and the northern Black Forest is close enough that a runner can be sitting beside a forest river by the same evening. September in the northern Black Forest genuinely still counts as hiking season, unlike the shoulder-season timing that catches out some autumn marathon weekends elsewhere: trails are dry more often than not, days are still long enough for a proper afternoon walk, and the forest itself hasn't yet turned toward the wetter, colder conditions that arrive from October. That said, forest weather at this elevation can turn warm, wet, or both within the same afternoon, so the first day after a marathon is a day for short, easy trails rather than any kind of summit attempt. Regional trains run from Karlsruhe Hauptbahnhof to Baden-Baden in around 20-25 minutes, with no advance booking required for a journey this short.
Nights One and Two: Baden-Baden and the Murg Valley
Baden-Baden works well as a base for this trip precisely because it sits at the mouth of the Murgtalbahn, a regional railway that runs directly along the Murg river into the forest, stopping at a string of small valley towns without requiring a car. On the first evening, after the journey from Karlsruhe, Lichtentaler Allee is the obvious short walk: a flat, gravel-paved promenade along the Oos river, around 2.3km one-way, with an arboretum planted alongside it and benches at regular intervals, exactly the low-effort option a marathon finish line calls for on day one.
On the second day, with legs recovering rather than fully recovered, the Murgtalbahn reaches Gernsbach in around 20 minutes, a half-timbered old town on the Murg with a flat riverside path running along the water for gentle walking without commitment to any real distance. Forbach, a further 15-20 minutes up the line, adds the Alte Holzbrücke, a large historic covered wooden bridge across the Murg, worth the stop on its own even for a short visit. Both towns keep genuine forest hiking trails within a short walk of the station for anyone whose legs have recovered enough by the second day to want more than a riverside stroll, though anything involving real elevation gain is better saved for a return trip than attempted 48 hours after a marathon.
For where to stay, a hotel in Baden-Baden's old town within walking distance of Lichtentaler Allee gives the best base: close enough to the Murgtalbahn's Baden-Baden stop for easy day trips into the valley, and close enough to the promenade for an easy evening walk without needing transport at all. For dinner, the Murg valley and Black Forest more broadly are the home ground of Schwarzwälder Kirschtorte, the Black Forest gateau, and it turns up on menus throughout Baden-Baden and the valley towns in versions considerably better than the export cliché suggests; a café on Gernsbach's own riverside makes as good a place as any to try it after a short valley walk.
Getting to Frankfurt Airport (FRA)
Frankfurt Airport is the practical gateway for an international flight home from this part of the Black Forest. Direct or one-change InterCity Express services run from Baden-Baden Hauptbahnhof to Frankfurt Airport's long-distance station, journey time in the region of an hour and forty minutes. Booking the ICE leg in advance through bahn.de can secure a lower fare and a reserved seat, worth doing if travelling with luggage and connecting to a specific flight rather than building in a wide buffer.
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